Pipe-wrench



J.. K; SHEPPY. PIPE WRENCH.

Patented Jan. 21, 1896.

JAY K. SIIEFFY, OF CHICAGO, ILLINOIS.

PIPE-WRENCH.

SPECIFICATION forming part of Letters Patent No. 553,362, dated January 21, 1896. Application filed August 17, 1895. Serial No. 559,624. (No model.)

To whom it may) concern: Be it known that I, JAY K. SHEFFY, acitizen of the United States, and a resident of Chicago, in the county of Cook and State of I'ilinois, have invented certain new and useful Improvements in liper l frenches; and I do declare the following to be a full, clear, and

exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, ref erence being had to the accompanying drawing's, and to-the letters of reference marked thereon, which form a tion.

The invention relates to that type of pipe-' wrenches in which a pair of movable jaws is employed and forced together by a cam action of a lever pivoted to one of the jaws and part of this specificaserving as a handle for the tool. Its object 18 to provide an improved form of jaw, an-

improved connection between the hand-lever and the jaws and positive'means for opening the jaws.

The invention consists in forming the larger jaw as a J-shaped hook, and pivoting the smaller'jaw or dog to the stem of, the larger one in sucha manner that it will close the mouth of the latter, and in the peculiar form of the hand-lever so that it has a positive cam action upon the smaller jaw both to force it into action and release it therefrom.

In the accompanying drawings, Figure 1 is a side elevation of the wrench, the jaws being opened. Fig. 2 is a similar view, the jaws being closed. Fig; dis a bottom plan View of the wrench in its position as shown in Fig. 1. Fig. 4 is a plan view, the wrench being in the-same position. Fig. 5 is atrans- Verse section on theline 5 5 of Fig; 1.

The handle A is a lever of the first class,

its fulcrum being the pivot-pin I), by which it is secured to the largerjaw B. This jaw is in the form of the letter J, the pivot-pin D being near the end of its stem, which is bifurcated to receive the handle A, and also the smaller jaw or dog 0, which is pivotally secured, as shown at E.

The inner surface of the larger jaw B is toothed through its curved portion,as indicated at 'b', and the face of the jaw U, which opposes the toothed portion of the larger jaw, is toothed, as indicated at c. The jaw 0 its pivotal point, and its back or rearward face is in the form of a compound curve, being convex at each end, as shown at F G, and concave at its middle portion, as indicated at f.

The handle A has a forwardly projecting toe-piece H, which presents a convex face h to the convex face F of the dog'O, and abackwardly-projecting heel-piece M which presents a convex face on to the convex face G of the jaw C.

The jaw 15 being caught ovcrthe pipe tobe operated upon a bite upon the pipe is secured by longitudinal draft upon the handle which tends to bring the larger jaw into the position relatively as to the handle indicated in Fig. 2, and consequently causes the depression of the jaw G by the toe-piece ll. Pressure upon the handle in the direction of the pipe and allows the wrench to be moved back for a new bite. The wrench is disengaged from the pipe by backward pressure upon.

the handle, throwing the heel M against the rearward end G of the jaw C so that its end F is raised.

The curved form of the jaw B insures contact with the surface of the pipe through a considerable portion of its circumference, so that there is no tendency to flatten the pipe, however, much pressure may be applied, and in order to crush it the circumference of the pipe must needs be reduced. By actual tests I have found that under the action of this wrench a pipe will be twisted off before any distortion occurs by reason of the pressure upon it of the jaws. The curved fornnof the larger jaw also admits of the use of the wrench in very contracted positions, and furthermore insures great strength, andconsequently admits of the tool beingim'rdecomparatively light.

The end of the lever A is concave between the toe H and the heel M, to receive the convex end G of the jaw O as the parts approach the position shown in Fig. 2. The toothed face 0 of the jaw O is made wide, as more plainly projects backwardly a short distance from indieat-ed in Fig. -t, so as to seem-e an extended area of contact with the pipe. 'i'his wide face is seenred by forming the jaw with lateral extensions 0 e.

' The outer end a. of the handle is so shaped as to be conveniently grasped.

\Vhile I have described the \vreneh for use in turning tubes or rods, it is equally serviceable as a nut-wrench, and is much more etiieientt'or sueh purpose than a wrenrh with fixed jaws, though such jaws may he adj ustable, for the reason that it need not be lifted from the nut in taking; a new hold, but will freely slide haek over the angles of the nut.

I eiaim as my invention- 1. in a pipe wrench the vomhination with. a hook-shaped jaw, of a jaw t pivoted to the stem of the hook so as to elose across its mouth and having a haehwardly extending; heel, and a hand lever pivoted to thestem of the hooked jaw and having a toe adapted to bear upon the haek of the forward end oi. the jaw and aheel adapted to bear upon the hack of the rearward end of the said jaw whereby the angular movement in either direetion of the handle with referenee to the hooked jaw positively aetuates the jaw 0, substaniiailyas described and for the purpose specified.

2. In a pipe wrench the eomhination with -a hooked jaw 12, of a jaw (J pivoted to the stem of the jaw B and adapted to extend across its mouth and having a ha'ekwardly extending heel, the jaw (l, having its haek convex at each end and intern]ediately eoncave, and a hand lever pivoted to the stem of the jaw ii, and having; a. toe piece for eontaet with'the i' orwa rd end of the jaw (f and a heel piece for contact with the rearward end ofsueh jaw, such hand lever having a recess between its toe and heel to receive the rearward end of the jaw (3 when its forward end is depressed, suh'stantiall as described and t or the purpose specified.

In testimony whereof'I atlix my signature in the presenee of two witnesses.

- JAY K. Sll lll i Y'. Witnesses:

Louis K. (lILLsoN,

Him ll. (HLLSUN. 

